ISL8844AABZ Intersil, ISL8844AABZ Datasheet

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ISL8844AABZ

Manufacturer Part Number
ISL8844AABZ
Description
IC PWM CTRLR SGL-ENDED 8-SOIC
Manufacturer
Intersil
Datasheet

Specifications of ISL8844AABZ

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
2MHz
Duty Cycle
50%
Voltage - Supply
9 V ~ 30 V
Buck
Yes
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 105°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
2MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ISL8844AABZ
Manufacturer:
Intersil
Quantity:
500
High Performance Industry Standard
Single-Ended Current Mode PWM
Controller
The ISL884xA is a high performance drop-in replacement for
the popular 28C4x and 18C4x PWM controllers suitable for a
wide range of power conversion applications including
boost, flyback, and isolated output configurations. Its fast
signal propagation and output switching characteristics
make this an ideal product for existing and new designs.
Features include 30V operation, low operating current, 90μA
start-up current, adjustable operating frequency to 2MHz,
and high peak current drive capability with 20ns rise and fall
times.
Pinout
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
PART NUMBER
ISL8840A
ISL8841A
ISL8842A
ISL8843A
ISL8844A
ISL8845A
COMP
RTCT
CS
FB
(8 LD SOIC, MSOP)
RISING UVLO
1
2
3
4
TOP VIEW
14.4V
14.4V
8.4V
8.4V
7.0
7.0
®
1
Data Sheet
8
7
5
6
MAX. DUTY CYCLE
VREF
VDD
OUT
GND
100%
100%
100%
50%
50%
50%
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
ISL8840A, ISL8841A, ISL8842A,
ISL8843A, ISL8844A, ISL8845A
Features
• 1A MOSFET gate driver
• 90μA start-up current, 125μA maximum
• 35ns propagation delay current sense to output
• Fast transient response with peak current mode control
• 30V operation
• Adjustable switching frequency to 2MHz
• 20ns rise and fall times with 1nF output load
• Trimmed timing capacitor discharge current for accurate
• 1.5MHz bandwidth error amplifier
• Tight tolerance voltage reference over line, load and
• ±3% current limit threshold
• Pb-free plus anneal available and ELV, WEEE, RoHS
Applications
• Telecom and datacom power
• Wireless base station power
• File server power
• Industrial power systems
• PC power supplies
• Isolated buck and flyback regulators
• Boost regulators
deadtime/maximum duty cycle control
temperature
Compliant
All other trademarks mentioned are the property of their respective owners.
April 18, 2007
Copyright © Intersil Americas Inc. 2005, 2006, 2007. All Rights Reserved.
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
FN6320.3

ISL8844AABZ Summary of contents

Page 1

... CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 All other trademarks mentioned are the property of their respective owners. FN6320.3 | Intersil (and design registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2005, 2006, 2007. All Rights Reserved. ...

Page 2

... Ld MSOP M8.118 (See Note) 2 Ordering Information PART PACKAGE PKG. NUMBER* (Pb-free) DWG. # ISL8843AMBZ M8.15 (See Note) ISL8843AMUZ (See Note) ISL8844AABZ M8.15 (See Note) ISL8844AAUZ (See Note) ISL8844AMBZ M8.15 (See Note) ISL8844AMUZ (See Note) ISL8845AABZ M8.15 (See Note) ISL8845AAUZ (See Note) ISL8845AMBZ M8 ...

Page 3

Functional Block Diagram V DD START/STOP UV COMPARATOR GND TOTAL = 1.15V ERROR AMPLIFIER COMP VREF 100k 2.9V 1.0V 150k OSCILLATOR COMPARATOR <10ns - ...

Page 4

Typical Application - 48V Input Dual Output Flyback 36V TO 75V VR1 CR2 C5 CR6 R22 R27 U4 R26 COMP CS FB RTCT ISL884xA ...

Page 5

Typical Application - Boost Converter L1 VIN+ C1 VIN- R8 C10 CR1 VREF COMP VDD FB CS OUT C4 RTCT GND R3 C7 +VOUT + C2 C3 RETURN VIN+ C5 ...

Page 6

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A Absolute Maximum Ratings Supply Voltage GND -0.3V to +30V DD OUT . ...

Page 7

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A Electrical Specifications ISL884xAA - Typical Application schematic onpage 3 and page 4. V (Note 3). Typical values are at T PARAMETER Input Signal, Maximum = ΔV Gain, A /ΔV CS COMP ...

Page 8

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A Electrical Specifications ISL884xAM Typical Application schematic. V are at T PARAMETER UNDERVOLTAGE LOCKOUT START Threshold (ISL8840A, ISL8841A) START Threshold (ISL8843A, ISL8845A) START Threshold (ISL8842A, ISL8844A) STOP Threshold (ISL8840A, ISL8841A) STOP Threshold (ISL8843A, ISL8845A) STOP ...

Page 9

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A Electrical Specifications ISL884xAM Typical Application schematic. V are at T PARAMETER Amplitude, Peak to Peak RTCT Discharge Voltage (Valley Voltage) Discharge Current OUTPUT Gate VOH Gate VOL Peak Output Current Rise Time Fall Time ...

Page 10

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A Typical Performance Curves 1.001 1.000 0.998 0.997 0.996 -60 -40 - TEMPERATURE (°C) FIGURE 3. EA REFERENCE vs TEMPERATURE Pin Descriptions RTCT - This is the oscillator timing control pin. ...

Page 11

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A Soft-Start Operation Soft-start must be implemented externally. One method, illustrated below, clamps the voltage on COMP. VREF D1 R1 COMP Q1 GND C1 FIGURE 5. SOFT-START The COMP pin is clamped to the voltage ...

Page 12

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A The current sense signal at the end of the ON time for CCM operation is ⋅ ⋅ ⋅ ⎛ – ⎞ ⎜ ...

Page 13

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A Example 12V 48V 800μH s Ns/ 8.0μ 200mA O Switching Frequency 200kHz sw Duty Cycle 28.6% ...

Page 14

ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A Small Outline Plastic Packages (SOIC) N INDEX 0.25(0.010) H AREA E - SEATING PLANE - -C- α 0.10(0.004) 0.25(0.010 NOTES: ...

Page 15

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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